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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db3c5c93037d5073ba7718b19c18376e124c9f6038cc690141ac3d5a6af7504' 
  AND token = 'Vvm8AAONgjMivKLqrQbYe0barElFo4eropHxd+81+T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}